Yahoo Inc. on Monday said it will introduce a new test version of its leading Web-based e-mail service in the next two months, adding technology the Internet media company acquired with its purchase last year of Oddpost.

Among the new features are drag-and-drop message organization, a preview pane to view e-mails instantly, the ability to search e-mail headers, body and attachments, as well as viewing multiple e-mails in different windows.

A Yahoo spokeswoman said that the upgraded version of Yahoo e-mail is being used internally and will be rolled out to a limited group of users in the next two months. It will be available to all Yahoo e-mail users once the company has finished its testing, Yahoo said.